[vtkusers] How to get 'connected' neighbors of polydata point within radius

[Jana Sefcikova]

Hi all,
I would like obtain all neighbors of seed point in polydata within given
radius. There should exist  path between the seed point and point concerned
to be neighbor within region.

I know that kdTree returns point within radius, but they does not met my
connection condition.
Is there any other filter, that I could use ? or data  structure that would
support this operation ?

Thank you
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